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IUCN online database, accessed on February 2013
Uploaded on Monday 11 Mar 2013
Great apes population estimates
Riccardo Pravettoni, GRID-Arendal
All great ape species have experienced considerable declines in population size and range over the past few decades. The International Union for Conservation of Nature (IUCN) Red List of Threatened Species lists all of the great apes as either Endangered or Critically Endangered and all great apes except the Mountain gorillas show decreasing population trends. Most notably, fewer than 300 Cross River gorillas are left in
West Africa; as few as 2,000 Eastern Lowland gorillas remain; and it is believed that as few as 6,600 Sumatran orangutans can be found in the wild.